/**
 * (C) Copyright IBM Corp. 2010, 2015
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 */


package com.ibm.bi.dml.runtime.matrix.data;

import org.apache.hadoop.io.DoubleWritable;
import org.apache.hadoop.io.IntWritable;

public class WeightedPairToSortInputConverter implements 
Converter<MatrixIndexes, WeightedPair, DoubleWritable, IntWritable>
{
	
	private DoubleWritable outKey=new DoubleWritable();
	private IntWritable outValue=new IntWritable();
	private Pair<DoubleWritable, IntWritable> pair=new Pair<DoubleWritable, IntWritable>(outKey, outValue);
	private boolean hasValue=false;
	@Override
	public void convert(MatrixIndexes k1, WeightedPair v1) {
		outKey.set(v1.getValue());
		outValue.set((int)v1.getWeight());
		hasValue=true;
	}

	@Override
	public boolean hasNext() {
		return hasValue;
	}

	@Override
	public Pair<DoubleWritable, IntWritable> next() {
		if(!hasValue)
			return null;
		
		hasValue=false;
		return pair;
	}

	@Override
	public void setBlockSize(int rl, int cl) {
		//DO nothing
	}

}
